OFFSET
0,2
FORMULA
Logarithmic derivative yields A216584.
EXAMPLE
PROG
(PARI) {a(n)=polcoeff(exp(sum(m=1, n+1, binomial(2*m, m)*polcoeff((1+x+x^2)^m, m)*x^m/m+x*O(x^n))), n)}
for(n=0, 30, print1(a(n), ", "))
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Sep 09 2012
STATUS
approved